How to Install Extension Spring Safety Cables - DDM Garage Doors Blog

Posted January 7th, 2023 at 7:27 pm by Philip Kendall

When extension springs break, they have a tendency to explode everywhere, making them very dangerous. Therefore, it is best to be proactive and install extension spring safety cables.

This is a relatively easy job to undertake, and usually only takes a few minutes.


To install a safety cable, you will need a garage door cable fitted with an open loop on one end and a adjustment clip on the other. In addition, you will need a nut and a bolt to secure the clip-end of the cable to the track bracket.

We also sell pre-prepared safety cables for 7-foot and 8-foot high doors. Otherwise, you will need to prepare the safety cables yourself.

Loop the cable over a support beam, and push the bracketed end through the looped end before pulling it tight
Start by looping the cable over a support beam

Installing the cable

  1. Loop the cable over a support beam.
  2. Push the end with the adjustment clip through the looped end of the cable.
  3. Pull the loop tight
  4. Next, feed the end with the clip through the spring.

Make sure the end of the cable goes through the spring completely. If the cable goes out through the coils, it could pinch and wear the cable prematurely. In addition, this could damage the spring and the pulley.

Feed the cable through the spring. This should keep the spring from flying off and damaging something in your garage if it breaks
Feed the cable through the spring
  1. After this, attach the cable to the track bracket, using a bolt and nut. The cable should be tight, but a small amount of slack is fine.
  2. Finally, tighten the nut, securing the cable to the track bracket.
Attach the other end of the cable to the track bracket.
Secure the cable to the track bracket

Now, if the extension spring breaks the cable will keep it from hitting someone or damaging property.

For more information about installing cables, visit our DIY instructions page. We also have pages with more information about sectional extension springs and one-piece extension springs. If you need to replace your extension springs, read our tutorial about how to replace garage door extension springs.

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